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Because a sample is information obtained from the population that will be used in hypothesis testing.

WER 1.19.2011

Samples are used to save time and money when the population is large and when the units must be destroyed to gain information.

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Because collecting information from the whole population may not be possible, may take too long or may be very expensive. Furthermore, if a sample is well designed, the improvement in accuracy of the results will diminish rapidly so there is little to be gained from collecting all the data.

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Q: Why are sample used in statistics?
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